微动信号模拟及其在微动勘探中的应用

doi:10.11720/wtyht.2023.1303

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Abstract

This study synthesized microtremor signals using the normal mode superposition.The dispersion curves of the synthesized microtremor signals were calculated using the spatial autocorrelation method,and the calculated results agreed well with theoretical dispersion curves.The simulation of microtremor signals involves many parameters,which are of great significance for microtremor exploration.As shown by results from numerical experiments of these parameters,the hypocentral distance and array size had a significant influence on the results.Moreover,high-order surface waves should be considered for complex strata,while small-size arrays tended to yield high-frequency dispersion information at quiet observation sites,thus improving the resolution of shallow strata.Therefore,it is necessary to consider the influences of hypocenter distribution,array size,and high-order surface waves on exploration results in microtremor exploration.

Key words： microtremor signal normal mode superposition microtremor exploration dispersion curve spatial autocorrelation method

Received: 16 June 2022 Published: 11 October 2023

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	Articles by authors
	Chuan-Jin LI
	Qiang WANG
	Xiang JIAN
	Tao ZHENG
	Su-Hua ZHAN
	Shao-Wei CHEN

Cite this article:

Chuan-Jin LI,Qiang WANG,Xiang JIAN, et al. Microtremor signal simulation and its application in microtremor exploration[J]. Geophysical and Geochemical Exploration, 2023, 47(4): 1040-1047.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1303 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I4/1040

Parameters of geological model

Array configuration

Sources distribution

The vertical component wave of the synthetic microtremor signal

Spatial autocorrelation coefficients

Frequency spectrogram of synthetic microtremor signal

Comparison of theoretical and synthetic dispersion curves

Dispersion curves with different sources distances
a—source distance in the range of 1 to 50 m;b—source distance in the range of 50 to 200 m;c—comparison of dispersion curves

Dispersion curves with different array sizes
a—R=1 m;b—R=100 m;c—comparison of dispersion curves

Parameters of geological model with high velocity interlayer

Dispersion curves with high velocity interlayer
a—dispersion curve calculated by synthetic microtremor signal;b—power fractions to different modes of Rayleigh waves;c—comparison of dispersion curves

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